检索结果-南通市图书馆

Science Letters:Energy harvesting with a slotted-cymbal transducer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1187-1190页

作者： Jiang-bo YUAN xiao-biao shan Tao XIE Wei-shan CHEN Department of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China

A cymbal transducer is made up of a piezoceramic disk sandwiched between two dome-shaped metal *** circumferential stresses caused by flexural motion of the metal endcaps can induce the loss of mechanical input *** element analysis shows that the radial slots fabricated in metal endcaps can release the circumferential stresses,and reduce the loss of mechanical input energy that could be converted into electrical *** this letter,the performance of a slotted-cymbal transducer in energy harvesting was *** results show that the output voltage and power of the cymbal are improved.A maximum output power of around 16 mW could be harvested from a cymbal with 18 cone radial slots across a 500 kΩ resistive load,which is approximately 0.6 times more than that of the original cymbal transducer.

关键词： Piezoelectric Cymbal transducer Energy harvesting

Protective effects of components of the Chinese herb grassleaf sweetflag rhizome on PC12 cells incubated with amyloid-beta42

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第8期10卷 1292-1297页

作者： Zi-hao Liang xiao-hui Cheng Zhi-gang Ruan Han Wang shan-shan Li Jing Liu guo-ying Li Su-min Tian Department of Anatomy and Histology Basic Medical College Guangdong Pharmaceutical University Department of Physiology Basic Medical College Guangdong Pharmaceutical University

The major ingredients of grassleaf sweetflag rhizome are β-asarone and eugenol, which can cross the blood-brain barrier and protect neurons. This study aimed to observe the neuroprotective effects and mechanisms of β-asarone and eugenol, components of the Chinese herb grassleaf sweetflag rhizome, on PC12 cells. First, PC12 cells were cultured with different concentrations（between 1 × 10–10 M and 1 × 10–5 M） of β-asarone and eugenol. Survival rates of PC12 cells were not significantly affected. Second, PC12 cells incubated with amyloid-beta42, which reduced cell survival, were cultured under the same conditions（1 × 10–6 M β-asarone and eugenol）. The survival rates of PC12 cells significantly increased, while expression levels of the m RNAs for the pro-apoptotic protein Bax decreased, and those for the anti-apoptotic protein Bcl m RNA increased. In addition, the combination of β-asarone with eugenol achieved better results than either component alone. Our experimental findings indicate that both β-asarone and eugenol protect PC12 cells through inhibiting apoptosis, and that the combination of the two is better than either alone.

关键词： nerve regeneration drugs Chinese herbal Alzheimer’s disease PC12 cells Aβ grassleaf sweetflag rhizome β-asarone eugenol apoptosis neural regeneration

Convergence of Markov decision processes with constraints and state-action dependent discount factors

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2020年第1期63卷 167-182页

作者： xiao Wu Xianping guo School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China School of Mathematics Sun Yat-sen UniversityGuangzhou 510275China

This paper is concerned with the convergence of a sequence of discrete-time Markov decision processes(DTMDPs)with constraints,state-action dependent discount factors,and possibly unbounded *** the convex analytic approach under mild conditions,we prove that the optimal values and optimal policies of the original DTMDPs converge to those of the"limit"***,we show that any countablestate DTMDP can be approximated by a sequence of finite-state DTMDPs,which are constructed using the truncation ***,we illustrate the approximation by solving a controlled queueing system numerically,and give the corresponding error bound of the approximation.

关键词： discrete-time Markov decision processes state-action dependent discount factors unbounded costs convergence

Midkine promotes perineural invasion in human pancreatic cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第11期20卷 3018-3024页

作者： Jun Yao Wen-Yao Li Shuo-guo Li xiao-shan Feng She-Gan Gao Department of Oncology First Affiliated HospitalHenan University of Science and Technology

AIM: To investigate midkine (MK) and syndecan-3 protein expression in pancreatic cancer by immunohistochemistry, and to analyze their correlation with clinicopathological features, perineural invasion, and prognosis.

关键词： Midkine Syndecan-3 Pancreatic cancer Neurite growth Perineural invasion

Assessment by meta-analysis of interferon-gamma for the diagnosis of tuberculous peritonitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第10期19卷 1645-1651页

作者： Si-Biao Su shan-Yu Qin xiao-Yun guo Wei Luo Hai-Xing Jiang Department of Gastroenterology the First Affiliated Hospital of Guangxi Medical University

AIM:To investigate the performance and diagnostic accuracy of interferon-gamma(IFN-γ) for tuberculous peritonitis(TBP) by ***:A systematic search of English language studies was *** searched the following electronic databases:MEDLINE,EMBASE,Web of Science,BIOSIS,LILACS and the Cochrane *** Standards for Reporting Diagnostic Accuracy initiative and Quality Assessment for Studies of Diagnostic Accuracy tool were used to assess the methodological quality of the ***,specificity,and other measures of the accuracy of IFN-γ concentration in the diagnosis of peritoneal effusion were pooled using random-effects *** operating characteristic(ROC) curves were applied to summarize overall test *** reviewers independently judged study eligibility while screening the ***:Six studies met the inclusion *** average inter-rater agreement between the two reviewers for items in the quality checklist was *** of IFN-γ level for TBP diagnosis yielded a summary estimate:sensitivity,0.93(95%CI,0.87-0.97);specificity,0.99(95%CI,0.97-1.00);positive likelihood ratio(PLR),41.49(95%CI,18.80-91.55);negative likelihood ratio(NLR),0.11(95%CI,0.06-0.19);and diagnostic odds ratio(DOR),678.02(95%CI,209.91-2190.09).χ 2 values of the sensitivity,specificity,PLR,NLR and DOR were 5.66(P = 0.3407),6.37(P = 0.2715),1.38(P = 0.9265),5.46(P = 0.3621) and 1.42(P = 0.9220),*** summary receiver ROC curve was positioned near the desirable upper left corner and the maximum joint sensitivity and specificity was *** area under the curve was *** evaluation of publication bias was not significant(P = 0.922).CONCLUSION:IFN-γ may be a sensitive and specific marker for the accurate diagnosis of *** level of IFN-γ may contribute to the accurate differentiation of tuberculosis(TB) ascites from non-TB ascites.

关键词： Tuberculosis Tuberculous peritonitis Interferon-gamma Diagnosis Meta-analysis

Reduced expression of circulating microRNA-218 in gastric cancer and correlation with tumor invasion and prognosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第22期20卷 6906-6911页

作者： Shi-Yong Xin xiao-shan Feng Li-Qing Zhou Jun-Jun Sun xiao-Le Gao guo-Liang Yao Department of Urology First Affiliated Hospital of Henan University of Science and Technology Department of Surgical Oncology First Affiliated Hospital of Henan University of Science and Technology Department of Rheumatism Immunity Branch First Affiliated Hospital of Henan University of Science and Technology Department of General Surgery First Affiliated Hospital of Henan University of Science and Technology

AIM:To investigate the expression of microRNA-218(miR-218)in serum from gastric cancer patients and its relationship with clinicopathological ***:A total of 68 patients with pathologically diagnosed gastric cancer and 56 healthy individuals were recruited to this *** expression of miR-218was detected in the serum of gastric cancer patients and healthy individuals by quantitative real-time polymerase chain *** clinical data were collectedand analyzed by statistical ***:miR-218 was reduced significantly in the serum of gastric cancer patients compared to healthy individuals(1.15±0.08 vs 0.37±0.023;P=0.026).In the gastric cancer group,serum expression of miR-218was lower in patients with metastasis and poorly differentiated cancer compared with non-metastatic and well-differentiated cancer(0.19±0.011 vs 0.45±0.021,P=0.031 and 0.21±0.019 vs 0.49±0.021,P=0.025).Serum miR-218 was found to be significantly associated with gastric cancer metastasis(P=0.003),tumor T stage(P=0.018)and tumor grade(P=0.012).Low serum expression of miR-218 was related to an increase in the stage of gastric *** expression level of miR-218 in the serum was correlated with the3-year ***-seven percent of patients with a high level of miR-218 expression survived for 3 years,while only 54%of those with low miR-218 expression ***:miR-218 is deregulated in gastric cancer patients and is strongly correlated with tumor stage,grade and *** expression of miR-218 may be a prognostic marker.

关键词： Gastric cancer microRNA-218 Invasion Prognosis

Foreword to the Special Issue

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2019年第1期32卷 1-2页

作者： GAO xiao-shan LI Hongbo WANG Dongming Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems Science University of Chinese Academy of Sciences Chinese Academy of Sciences LMIB–SKLSDE–School of Mathematics and Systems Science/Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Centre National de la Recherche Scientifique

On May 12,2019 we shall celebrate the centenary birthday of the late Professor Wu Wen-Tsun (1919-2017),one of the most famous and influential mathematicians in *** made foundational contributions to the field of topology and established Mathematics Mechanization as a *** devoted himself to an academic career of more than six decades with leadership and extensive activities of research and education across mathematics to computer science and artificial *** scope of his research spans from algebraic topology, differential topology,and algebraic geometry to automated reasoning,symbolic computation, and game theory,and to the history of *** early work in topology was a major breakthrough,leading to well-known and now classical results including the characteristic class and formulas named after *** the late 1970s,he pioneered the research of Mathematics Mechanization through his invention of the "Wu method",which revolutionized the field of automated reasoning.

关键词： shall celebrate centenary birthday established Mathematics

How Central Asian Orogeny Evolves:New Insights from End-Permian to Middle Triassic Magmatic Record along the Solonker Suture Zone

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2016年第5期90卷 1907-1908页

作者： LI shan CHUNG Sunlin Simon A.WILDE WANG Tao xiao Wenjiao guo Qianqian Institute of Geology Chinese Academy of Geological Sciences Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences Department of Geosciences National Taiwan University Institute of Earth Sciences Academia Sinica Department of Applied Geology Curtin University State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Computational Geodynamics University of Chinese Academy of Sciences

Objective The modem Earth is characterized by two types of orogens： collisional orogen and accretionary orogen. It is widely accepted that the Central Asian Orogenic Belt （CAOB） is made up of widespread multiple ancient archipelagos. It has been recognized as a non-collisional orogen, contrasting with the archetypical Alpine- Himalayan-type collisional orogens. Although the CAOB is traditionally compared to subduction-accretion systems that have been well studied, all accretionary orogens ultimately passed into a collisional phase at the end of the orogenic Wilson cycle due to ocean closure and termination of subduction, which will lead to subsequent crustal shortening, thickening and reworking. Therefore, the archipelago-type CAOB may also preserve a terminal collision record, although this is not a classic continental collision at all.

关键词： How Central Asian Orogeny Evolves

C-X-C chemokine receptor type 7 antibody enhances neural plasticity after ischemic stroke

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第9期18卷 1976-1982页

作者： xiao-Qian Zhang xiao-Yin Wang Bing-Chao Dong Mei-Xuan Li Yu Wang Ting xiao shan-shan Zhao Department of Neurology The First Hospital of China Medical UniversityShenyangLiaoning ProvinceChina Key Laboratory of Immunodermatology Ministry of HealthMinistry of EducationShenyangLiaoning ProvinceChina

Stromal cell-derived factor-1 and its receptor C-X-C chemokine receptor 4(CXCR4) have been shown to regulate neural regeneration after *** r,whether stromal cell-derived factor-1 receptor CXCR7,which is widely distributed in the develo ping and adult central nervous system,participates in neural regeneration remains poorly unde *** this study,we established rat models of focal cerebral ischemia by injecting endothelin-1 into the cerebral co rtex and *** on day 7 after injury,CXCR7-neutralizing antibody was injected into the lateral ventricle using a micro drug delivery system for 6 consecutive *** results showed that CXCR7-neutralizing antibody increased the total length and number of sprouting co rticospinal tra ct fibers in rats with cerebral ischemia,increased the expression of vesicular glutamate transporter 1 and growth-related protein 43,marke rs of the denervated spinal cord synapses,and promoted the differentiation and maturation of oligodendrocyte progenitor cells in the *** addition,CXCR7 antibody increased the expression of CXCR4 in the striatum,increased the protein expression of RAS and ERK1/2 associated with the RAS/ERK signaling pathway,and im proved rat motor *** findings suggest that CXCR7 improved neural functional recovery after ischemic stroke by promoting axonal regeneration,synaptogenesis,and myelin regeneration,which may be achieved by activation of CXCR4 and the RAS/ERK1/2 signaling pathway.

关键词： axonal regeneration cerebral ischemia C-X-C chemokine receptor 4 CXCR7 antibody neural plasticity RAS/ERK pathway remyelination stroke stromal cell-derived factor-1 synaptogenesis